My boyfriend’s ex still likes his mom’s Facebook photos and I’m losing it

so, i’ve been with "mike" for a year. his ex-gf from three years ago is still "besties" with his mom. every time his mom posts a photo of us at dinner, the ex is the first to like it and comment something like "miss you guys!" it feels like she’s Orbiting our entire family. mike says i’m being "jealous" and that he can't control his mom’s friends list. but it feels like i’m constantly being watched by a ghost.

The Breakdown:

• He Said: He’s neutral. He doesn't want to start drama with his mom over a "pixelated" problem.
• She Said: Her Secure Attachment is being threatened. The ex is using "familial proximity" to remain relevant in Mike’s life.

The Science: This is Triangulation. By maintaining a relationship with the family, the ex creates a "third point" in the couple's dynamic, which causes the current partner to feel unstable and secondary.

The Solution: "Mike, I’m not asking you to control your mom. I’m telling you that having your ex-partner constantly inserting herself into our milestones feels like a boundary violation. I need you to have my back and tell your mom that her public interactions with your ex make me uncomfortable."